Effect of Alkaline Surface Modification and Carbonization on Biochemical Properties of Rice and Coffee Husks for Use in Briquettes and Fiber- Reinforced Plastics
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Natural Fibers
Abstract
Effects of alkaline surface modification and carbonization on biochemical
properties of selected rice and coffee husk varieties in Uganda were studied.
Alkali pre-treatment was done by washing the husks in NaOH at a 15:1
liquor ratio. Pre-treatment is used in biomass conversion to overcome
chemical and structural difficulties. Carbonization resulted in production
of bio-char. Results showed increased cellulose contents for both the
husks and their bio-chars after pre-treatment with NaOH solution. Lignin
and hemi-cellulose compositions were reduced after pre-treatment in NaOH
solution. Bio-chars for all rice husk varieties showed an increase in lignin
content after carbonization. Lignin contents for Robusta coffee husks also
increased after carbonization. Cellulose content in bio-chars of both rice
and coffee husks reduced drastically after carbonization. A simple regression
model relating bulk density and biochemical composition was developed
at an accuracy of 70%. Alkaline surface modification and
carbonization effects on biochemical properties are due to their impact
on the non-cellulosic material and hydrophobicity, respectively, on the
fibers.
Description
Keywords
Bio-chemical, Briquettes, Bulk density, Coffee husks, Fiber-reinforced plastics, Hemicellulose
Citation
Vianney Andrew Yiga, Michael Lubwama & Peter Wilberforce Olupot (2019): Effect of Alkaline Surface Modification and Carbonization on Biochemical Properties of Rice and Coffee Husks for Use in Briquettes and Fiber-Reinforced Plastics, Journal of Natural Fibers, DOI: 10.1080/15440478.2019.1642824